C#, check whether integer array has negative numbers in it

Question

I have a array int[] numArray . I want to know is there any straight forward way to just check whether array has negative numbers in it ?

If there is no direct method even linq will do . I am bit new to linq . Can anyone suggest ?

Answer 1

If you're open to using LINQ:

var containsNegatives = numArray.Any(n => n < 0);

Or, if you want to do it the "old fashioned" way...you just have to loop:

var containsNegatives = false;

foreach(var n in numArray)
{
    if(n < 0)
    {
        containsNegatives = true;
        break;
    }
}

And if you really want to get fancy, you could turn that into an Extension method:

public static class EnumerableExtensions
{
    public static bool ContainsNegatives(this IEnumerable<int> numbers)
    {
        foreach(n in numbers)
        {
            if(n < 0) return true;
        }

        return false;
    }
}

And call it from your code like:

var containsNegatives = numArray.ContainsNegatives();

Answer 2

You could use Any:

bool containsNegative = numArray.Any(i => i < 0)

Or

bool containsNegative = numArray.Min() < 0;

---

EDIT

int[] negativeNumbers = numArray.Where(i => i < 0).ToArray();